Method of lining a structure with a delayed curing resin composition

ABSTRACT

A resin composition and method for installing a pipe liner that allows the liner to be fully wet out with a resin and activator and stored for a period of up to six months prior to installation and curing. A method of lining a pipe with a delayed curing resin composition is also provided that includes fully wetting out a liner with a blended two part epoxy composition such that the liner can be transported in a wet out fashion, placed in a pipe to be lined and repositioned as needed without concern for the resin composition to begin curing.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is continuation of and claims priority from earlierfiled U.S. patent application Ser. No. 16,502,107, filed Jul. 3, 2019,which claims priority from U.S. patent application Ser. No. 15,900,851,filed Feb. 21, 2018, which claims priority from Ser. No. 15/295,381,filed Oct. 17, 2016.

BACKGROUND OF THE INVENTION

The present invention generally relates to a delayed curing resincomposition. More specifically, the present invention relates to a resincomposition that allows the resin and catalyst to be mixed for anextended period creating a long pot life composition which cures onlywhen subjected to elevated temperature.

Generally, epoxy coatings are well known in the art and due to theirexceptional durability and structural properties epoxy based protectivecoatings have gained commercial acceptance as protective and decorativecoatings for use on a wide variety of materials. For example, epoxybased protective coatings represent one of the most widely used methodsof corrosion control. They are used to provide long term protection ofsteel, concrete, aluminum and other structures under a broad range ofcorrosive conditions, extending from atmospheric exposure to fullimmersion in highly corrosive environments. Further, epoxy coatings arereadily available and are easily applied by a variety of methodsincluding spraying, rolling and brushing. They adhere well to steel,concrete and other substrates, have low moisture vapor transmissionrates and act as barriers to water, chloride and sulfate ion ingress,provide excellent corrosion protection under a variety of atmosphericexposure conditions and have good resistance to many chemicals andsolvents. As a result, numerous industries including maintenance,marine, construction, architectural, aircraft and product finishing haveadopted broad usage of epoxy coating materials.

The most common material utilized in the epoxy coating industry today isa multi-part epoxy material. In general the epoxy includes a first baseresin matrix formed from a bisphenol material such as bisphenol A (BPA)and at least a second catalyst or hardener, although other componentssuch as a pigment agent or an aggregate component may also be added.While the two parts remain separate, they remain in liquid form. Afterthe two parts are mixed together, they begin a curing process that istypically triggered by exposure to heat, humidity or a ultra-violetlight source, whereby the mixed material quickly begins to solidify. Asa result, it is necessary to mix only a sufficient amount of compoundsuch that it can be worked effectively before set up occurs.Accordingly, the use and application of these compounds is a tedious,slow and expensive proposition.

The hardeners are typically nitrogen-containing bases that are wellknown to the person skilled in the art as curing agents or curingaccelerators for epoxy resins. Such systems have, however, only limitedstorage stability because those bases react with epoxides even atrelatively low temperature, in some cases even at room temperature,which is manifested in an increase in the viscosity of the epoxy resinformulation and, on prolonged storage, results in hardening of themixture. The greater the reactivity of the nitrogen-containing base, thelower the storage stability of the epoxy resin mixture and the shorterthe pot life. For that reason, such systems are formulated astwo-component systems, that is to say the epoxy resin and thenitrogen-containing base are stored separately and mixed only shortlybefore processing.

There has been no shortage of attempts at improving the storagestability of such systems by developing appropriate curing systems. Theproblem posed is particularly complex because, at the same time as therequirement for a high storage stability and a long pot life, thereshould not be any deterioration either in the reactivity at the desiredcuring temperature or in the properties of the fully cured materials.For example, adsorption techniques have been used to control and modifyvarious types of chemical reactions. These techniques usually involveadsorbing a chemical reagent in an adsorbent material. Commonly usedadsorbent materials for this purpose are materials having internal porestructure and active pore sites, and can consist of silica gel, certaintypes of carbon black, activated charcoal, and the like. In practice,when using an adsorbed chemical reagent in a process involving acontrolled chemical reaction, the adsorbed chemical reagent andadsorbent is admixed with the reacting component at relatively lowtemperatures and subsequently heated to desorb the adsorbed component.Heating the adsorbent and adsorbate product desorbs the adsorbatereagent reactant making it available for a reaction with a reactingcomponent. The mixture prior to being activated is relatively inert andfairly safe to handle.

While the aforementioned reagent adsorption solves many of the problemsin regard to process control, handling etc., there is in most instancesa slow escape of the chemical reagent from the adsorbent. In manyinstances, this slow escape of chemical reagent from the adsorbentcreates problems. The desorbed chemical reagent if in a reactiveenvironment or reactive medium will allow a slow reaction betweenreagents to proceed. If the rate of escape of reactant is large and theresulting reaction is exothermic there is a possibility that theexothermic heat effect will generate sufficient heat in the mixture todesorb and activate the entire mixture, or at least acceleratedesorption. Further, the slow escape of chemical reagent will causeproduct deterioration, and shortened shelf life of an adsorbed componentmixture. In general, depending on the type of adsorbent and adsorbatechemical reagent, the rate of escape of adsorbate from adsorbent willvary. Even a small escape of adsorbate is objectionable and in certaininstances can cause very serious effects.

In the reagent adsorption techniques known to the prior art, adsorbedchemical reagent when present in a surrounding medium containing areactive medium, is not rendered completely inert. In general, anadsorbent has an open pore structure. A portion of the adsorbed chemicalreagent is in immediate contact with the reactive medium and istherefore in a potentially reactive position. The adsorbed chemicalreagent molecules, even though attracted and held in the active poresites by Van der Waals forces will often be dislodged from the adsorbentby the normal molecular vibration of the chemical components, and willbe free to react with the reactive medium. The tendency to dislodge theadsorbed adsorbate and the seriousness of this effect will vary with thetype of adsorbate, the adsorbent and the reactive medium and the otherpossible components having a tendency to displace the adsorbate.Normally, the function of the adsorbent is to prevent or delay areaction between the adsorbed chemical reagent and a reactivesurrounding medium.

The more efficiently this function is performed, in general, the moredesirable is the adsorption system. Therefore, adsorption of chemicalreagents known to the prior art will not produce complete inertness, ofa chemical reagent. Further, if the adsorbent in the chemical reagentcombination is selected so that the adsorbate is very securely attachedto the adsorbent, thus producing a very inert adsorbent adsorbatecombination, it may require an extremely powerful displacing agent orheat effect to activate the material. For example, when the adsorbentadsorbate must be heated to extremely high temperatures in order todesorb the adsorbed reagent, other reagents in the mixture may bedecomposed. This effect may completely prohibit the use of an adsorbedchemical reagent. An example is a decomposable blowing agent in afoamable mixture that will cure at a relatively low temperature. If themixture is heated high enough to desorb the blowing agent, the reactionmay proceed too rapidly and scorch, burn or cure the resin poorly.

In view of the foregoing, there is a need for a delayed curing epoxyresin composition. Further, there is a need for a delayed curing epoxyresin wherein the hardener and resin components can be fully blended yetthe curing reaction still be delayed to provide the composition with along pot life. There is still a further need for method of lining a pipesystem whereby a liner is fully wet out with a blended two part epoxycomposition yet the curing reaction is delayed for an extended periodallowing the wet out liner to be stored and installed before thereaction is activated.

BRIEF SUMMARY OF THE INVENTION

In this regard, the present invention relates to a new resin compositionand method for installing a pipe liner that allows the liner to be fullywet out with a resin and activator and stored for a period of up to sixmonths prior to installation and curing. Further the present inventionprovides a method of lining a pipe with a delayed curing resincomposition that includes fully wetting out a liner with a blended twopart epoxy composition such that the liner can be transported in a wetout fashion, placed in a pipe to be lined and repositioned as neededwithout concern for the resin composition to begin curing.

The new resin is a base resin composition consisting of a blend ofanhydrides, bisphenol A, and bisphenol F resins. The resin blend iscombined with proprietary activator component to create a new epoxycomposition that has an extended shelf life of up to six months afterthe base resin is mixed with the activator component. This compositionprovides for a resin wherein the curing process can be delayedindefinitely prior to the application of a specific threshold of heat.

Another unique feature is that in the prior art the resins of thepresent invention would fail when applied in a wet condition. In theknown industry, anhydrides based epoxies will not stick or have anyadhesion at all to a wet surface. Further, other epoxy resins and theamino amine activators will not have strong adhesion to wet substrates.In contrast, the resin composition, as a result of the activatorcomponent disclosed herein, allows the composition to adhere to and cureon saturated wet surfaces.

In accordance with the method of the present invention, the methodtargets the cured in place liner industry for potable water lines,especially asbestos and lead lined pipe. The benefit to the industry isthat the pipe lining bags can be wetted out in factory conditions andshipped across the country without the need of refrigerated transporttrailers. The other major benefit is, once the bag reaches the job site,there is no reason to rush or hurry the installation process. The mixedresin installed in the liner at the factory will have a shelf life of upto 90 days without any chance of an exothermic reaction causing cureresulting in losing the bag, or the threat of spontaneous combustionwhich can happen with other wetted out liners.

Therefore, it is an object of the present invention to provide a delayedcuring epoxy resin composition. Further, it is an object of the presentinvention to provide a delayed curing epoxy resin wherein the hardenerand resin components can be fully blended yet the curing reaction stillbe delayed to provide the composition with a long pot life. It is stilla further object of the present invention to provide a method of lininga pipe system whereby a liner is fully wet out with a blended two partepoxy composition yet the curing reaction is delayed for an extendedperiod allowing the wet out liner to be stored and installed before thereaction is activated.

These together with other objects of the invention, along with variousfeatures of novelty which characterize the invention, are pointed outwith particularity in the claims annexed hereto and forming a part ofthis disclosure. For a better understanding of the invention, itsoperating advantages and the specific objects attained by its uses,reference should be had to the accompanying drawings and descriptivematter in which there is illustrated a preferred embodiment of theinvention.

BRIEF DESCRIPTION OF THE DRAWINGS

In the drawings which illustrate the best mode presently contemplatedfor carrying out the present invention:

FIG. 1 is a side cross-sectional view of a pipeline within the groundshowing a collapsed lining hose placed in position in the pipeline inaccordance with the method of the present invention;

FIG. 2 is a cross-sectional view through the line 2-2 of FIG. 1 showingthe layers of the lining hose;

FIG. 3 is a cross-sectional view through the line 3-3 of FIG. 1 showingthe step of the calibration hose pressing the lining hose intocommunication with the inner wall of the pipeline; and

FIG. 4 is a cross-sectional view through the line 3-3 of FIG. 1 showingthe lining hose fully installed after the calibration hose has beenremoved in accordance with the method of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

Disclosed herein is a resin composition and method for installing a pipeliner that allows the liner to be fully wet out with a resin andactivator and stored for a period of up to six months prior toinstallation and curing. Further, the present invention discloses amethod of lining a pipe with a delayed curing resin composition thatincludes fully wetting out a liner with a blended two part epoxycomposition such that the liner can be transported in a wet out fashion,placed in a pipe to be lined and repositioned as needed without concernfor the resin composition to begin curing.

The composition of the present invention is a new blended resincomposition consisting of a blend of cyclic anhydrides, bisphenol A, andbisphenol F resins. While single component, heat cured epoxycompositions have been disclosed in the past, the blended componentshave a relatively short shelf life and require that, once blended, theone component epoxy be stored and transported in refrigeration. Theresin blend of the present invention is combined with proprietaryactivator component to create a new epoxy composition that has anextended shelf life of up to six months after the base resin is mixedwith the activator component. This composition provides for a resinwherein the curing process can be delayed indefinitely prior to theapplication of a specific threshold of heat.

It is known that primary and secondary amines and their epoxy-adductsare the most widely used activators for epoxy resins. The selection ofan activator plays an important role in determining the finalperformance of the epoxy-amine thermoset. The ethyleneamine hardenerssuch as tetraethylenepentamine (TEPA), when cured with epoxy resins,provide excellent reactivity and physical properties including excellentchemical and solvent resistance but are brittle and have limitedflexibility and toughness. However, it is also well known that theseethyleneamines have poor compatibility with epoxy resins and will blushunder humid conditions. In wet conditions the activators can exude tothe surface during cure and react with atmospheric carbon dioxide andmoisture to form undesirable carbamates also known as ‘blush’.

The activator of the present composition is a composition that preblendsthe TEPA activator in an activator preblend composition composed of asmall percentage of liquid bisphenol, granular bisphenol and thetetraethylenepentamine (TEPA) activator. The activator is fully blendedin a manner that overcomes the issues previously known when utilizingTEPA activators. This preblend activator is then combined with the baseresin material. In the prior art, if the base resin were to be mixedwithout the activator of the present invention the resin compositionbegins to cure in 48 hours into an unworkable gel. However, with theactivator preblend composition disclosed herein, the blended, onecomponent composition remains fully liquid and workable having a potlife of up to six months.

Another unique feature is that in the prior art the resins of thepresent invention would fail when applied in a wet condition. In theknown industry, anhydrides based epoxies will not stick or have anyadhesion at all to a wet surface. Further, other epoxy resins and theamino amine activators will not have strong adhesion to wet substrates.In contrast, the resin composition, as a result of the activatorcomponent disclosed herein, allows the composition to adhere to and cureon saturated wet surfaces.

Once the line is installed and inspected and everything is satisfactory.Steam is then applied to inflate the liner and raise the temperature to170° and hold it at 170° for one hour. The material will spike out inbetween 380 and 400° on the exotherm, and this will give a much higheroperating temperature for the finished lined pipe. It should beappreciated that the liner of the present invention may be inflatedusing a calibration hose, however, many liners currently in use have anairtight layer formed therein that allows inflation of the liner withoutthe need for a calibration hose.

Not only can the new resin be used for drinking water, wastewater andfuel lines, it can also be used for steam and steam return lines Webelieve this new resin will revolutionize this industry worldwide andlead the way into the future for non-toxic, totally reliable, verystrong products with superior heat and chemical resistance capabilitiesfor future generations. We believe this material will have an expectedlife of 100 to 150 years in the ground based on private testing at theUniversity of Pittsburgh and the University of South Carolina. Testliners have been installed with and without the preblend activatorcomposition. Without the preblend activator, the adhesion results arenot favorable. With the preblend activator, there is strong adhesion ofthe liner to the host pipe.

In accordance with the process of the present invention, the insidesurface 9 of the pipeline 6, to be repaired, is preferably firstprepared to remove debris and dirt to ensure a good bond, as will bedescribed in detail below. Preferably, the inner wall surfaces 9 ofpipeline 6 are cleaned by injecting highly pressurized water into thepipeline. The pressurized water stream strikes the inside wallsforcefully and scrubs the walls. For example, the water is provided atup 30,000 psi to ensure a clean surface. Even higher pressure can beused, if necessary. Known water spraying devices are used for this stepof the process. The injected water substantially removes the foreigndebris to leave a clean inner wall surface 9 remaining. Whilehigh-pressure water is preferably used, air or steam may be usedinstead. Also, additional cleaning agents are not preferably used butsuch cleaning agents could be added to the water, air or steam to assistin cleaning depending the application and environment.

After surface cleaning is complete, any standing water left remaining,such as that on the bottom of the pipeline 6, must be removed.High-pressure air, using known air blowing equipment, is injected intothe pipeline to clear it of any remaining water and cleaning media.Referring to FIG. 1 , the host pipeline 6 having inside walls 9 withcracks 8 in their infrastructure is shown. A flexible lining hose 12,which has been fully wet out with the preblend resin composition of thepresent disclosure is prepared and positioned in the pipeline 6. Thelining hose 12 is inserted into the pipeline 6 by techniques known inthe industry. Preferably, the lining hose 12 is pulled or dragged intothe pipeline 6 in a collapsed state using a cable and winch-operatingsystem (not shown) that, for example, can use ¼ inch aircraft cable. Thelining hose 12 is introduced directly into the pipeline 6 so that itrests on the bottom surface of the pipeline 6. While it is preferredthat the lining hose 12 is dragged into the pipeline 6 to be repaired,it is also possible to invert the lining hose 12 into the pipeline 6through the use of compressed air or other fluids such as water.

Turning now to FIG. 2 , details of the construction of the lining hose12 of the present invention is shown. The flexible lining hose 12includes an outer layer 14 that surrounds an inner layer 16. The outerlayer 14 can be made from any suitable material that is rugged and whichwill adhere to thermosetting resin 10. Typically, the outer layer 14 ismade from a plastic material such as polyvinyl chloride, polyurethane,polyethylene, polypropylene, polyester, polyamide, or the like.

The inner layer 16 is a layer of non-woven fibrous material, preferablyfelt, is permanently adhered to the outer layer of the lining hose 12.The felt inner layer 16 is provided as a suitable resin-absorbingmaterial. More particularly, polyester-needled felt materials can beused to form the inner layer 16. These felt materials have goodresin-absorbency properties. The felt material soaks up the resin sothat the inner layer 16 becomes impregnated with the resin 17. The resin17 may be applied to the inner layer 16 using vacuum or injection.Alternately, the lining hose 12 may be filled with an amount of resin 17calculated to fully wet out the inner layer and the lining hose 12 canbe then drawn through rollers to squeeze the resin 17 into the innerlayer material 16. It is understood that the resin 17 can be applied tothe felt inner layer 16 directly at the pipeline site where the lininghose 12 will be installed or at an off-site coating facility and thentransported to the pipeline site.

Thus, the inner layer 16 is wetted out with the thermosetting resin 17in liquid form (“wet out”) prior to placing the lining hose 12 in thepipeline 6. As can be seen in FIG. 2 , the resin 17 is absorbed by andresides within the felt inner layer 16. Thus, the felt inner layer 16serves as a carrier for the resin 17.

In accordance with the method of the present invention, the methodtargets the cured in place liner industry for potable water lines,especially asbestos and lead lined pipe. The benefit to the industry isthat the pipe lining bags can be wetted out in factory conditions andshipped across the country without the need of refrigerated transporttrailers. The other major benefit is, once the bag reaches the job site,there is no reason to rush or hurry the installation process. The mixedresin installed in the liner at the factory will have a shelf life of upto 90 days without any chance of an exothermic reaction causing cureresulting in losing the bag, or the threat of spontaneous combustionwhich can happen with other wetted out liners.

This method further allows inspecting the bag positioning andinstallation prior to the final cure. This consists of a set of cansseals that will go on to each end of the pipe to be lined. Once the cansare in place, the line can be pressurized with the use of a small aircompressor. A camera can run up and down the line by inserting itthrough a small flapped door in the can at one end. and inspecteverything with pan and tilt capability to inspect bends, turns, 90s,45s, and any possible intruding pipes or anything in the line that couldbe detrimental to the final product. At temperatures below about 160degrees Fahrenheit the liner bag can still be deflated, reworked andrepositioned.

Referring to FIG. 3 , in one embodiment, a calibration hose, generallyreferred to as 18, is introduced into the resin-saturated lining hose 12using techniques known in the industry. The calibration hose 18 can bemade from materials such as polyvinyl chloride, polyurethane,polyethylene, polypropylene, polyesters, polyamides, or the like. Thecalibration hose 18 is not treated with a curing resin in the method ofthis invention. Most importantly, the calibration hose does not adhereto resin 17 residing in the felt inner layer 16. The calibration hose 18is inserted so that an outer peripheral region 18 a is in communicationwith inner layer 16. The outer peripheral region is held in place byclamps (not shown) or the like so that an inner region 18 b may beinverted therethrough. The calibration hose 18 is filled with apressurized fluid, namely, at middle region 18 c. Typically, water isused as the pressurized fluid by air or steam may be used. In oneembodiment for introducing the calibration hose 18 into the lining hose12, a known inversion technique is used. As the pressurized fluid isdirected into the middle region, the calibration hose 18 is pulled viathe inner region 18 b. The inverted calibration hose 18 walks along theinside of the lining hose 12 and expands and presses it against theinner wall 9 of the pipeline 6.

The use of pressurized water (not shown) to invert the calibration hose18 has several benefits. Particularly, the calibration hose 18 is filledwith water gradually so that the calibration hose 18 walks-through thepipeline 6. As the calibration hose 18 is fed into the lining hose 12,it can easily travel, as shown in FIG. 1 , from a vertical pipelinesection 6 b to a horizontal pipeline section 6 a and vice versa. Forexample, vertical pipelines 6 b generally refer to auxiliary pipelinesthat communicate with a horizontal (main) pipeline 6 a. Joint connectors6 c are provided to transition from a horizontal section 6 a to avertical section 6 b. It is these joint sections that pose particularproblems with prior art processes for repairing pipelines because airpockets are frequently introduced and lining hoses break or rip at thesejoints. However, with the present invention, air pockets in thecalibration hose 18 are eliminated by slowly filling the calibrationhose 18 with water and so that the joint sections 18 c are completelysealed to completely fill cracks, stop leaks to provide a monolithicepoxy inner layer, even at joint sections 18 c.

The pressurized water makes the inverted calibration hose 18 pushagainst the flexible lining hose 12 and forces the lining hose 12outwardly so that it presses against and engages the interior walls 9 ofthe pipeline 6. As a result, the lining hose 12 contacts and conforms tothe shape of the internal pipeline walls 9. Due to the durability of thelining hose 12, joint sections 18 c are adequately accommodated as thelining hose 12 is expanded and stretched to the contours of the innerwall surfaces 9 of the pipeline 6.

The water or steam injected into the calibration hose 18 is heated tosubstantially cure and harden the resin 17. Preferably, the water isheated to a temperature of at least 175° F. and more preferably to atemperature of about 180° F. The temperatures can vary depending on theresin selected for use. The curing reaction is exothermic so the curingof the resin, itself, generates heat that further improves the curingrate. Also, the resin 17 may contain additional heat-initiated curingagents that accelerate the curing process. Upon the curing and hardeningof the resin 17, the lining hose 12 becomes attached to the wallsurfaces 9.

The calibration hose 18 can then be removed from the lining hose 12using techniques known in the art. Typically, a rope or cable isattached to the trailing end of the calibration hose 18. An operatorpulls on the rope or cable to remove the calibration hose 18 from thelining hose 12. FIG. 4 shows the pipeline 4 with inside walls 6 afterthe calibration hose 18 has been removed. The lining hose 12 is firmlyfixed to the interior walls 6 of the pipeline.

The resulting pipeline is a repaired composite structure shown generallyas 4 in FIG. 4 , including the lining hose 12 adhered to the innersurface 9 of the pipeline 6. The resulting composite pipeline structure4 is rigid and has good mechanical integrity thus providing a leak-freeand completely sealed monolithic structure. The lined pipeline 4 hashigh mechanical integrity and strength because the voids formed by thepresence of periodic joints in the pipeline that are inherent inpipefitting. The method of the present invention enables the voids atthe joints to be filled to, in turn, provide a smooth and continuousinterior surface. Thus, the structural integrity is greatly improvedwhen a lining is installed in accordance with the present invention.

Various other components may be included and called upon for providingfor aspects of the teachings herein. For example, additional materials,combinations of materials and/or omission of materials may be used toprovide for added embodiments that are within the scope of the teachingsherein.

In the present application a variety of embodiments are described. It isto be understood that any combination of any of these variables candefine an embodiment of the invention. For example, a combination of aparticular dopant material, with a particular compound, applied in acertain manner might not be expressly stated, but is an embodiment ofthe invention. Other combinations of articles, components, conditions,and/or methods can also be specifically selected from among variableslisted herein to define other embodiments, as would be apparent to thoseof ordinary skill in the art.

While there is shown and described herein certain specific structureembodying the invention, it will be manifest to those skilled in the artthat various modifications and rearrangements of the parts may be madewithout departing from the spirit and scope of the underlying inventiveconcept and that the same is not limited to the particular forms hereinshown and described except insofar as indicated by the scope of theappended claims.

Therefore, it can be seen that the present invention provides s delayedcuring epoxy resin composition, wherein the hardener and resincomponents can be fully blended yet the curing reaction still be delayedto provide the composition with a long pot life. It can also be seenthat the present invention to provides a method of lining a pipe systemwhereby a liner is fully wet out with a blended epoxy composition yetthe curing reaction is delayed for an extended period allowing the wetout liner to be stored and installed before the reaction is activated.

What is claimed:
 1. A method of lining a pipe, comprising: providing alining hose; providing a base resin; providing an activator preblend;fully blending said activator preblend and base resin; wetting out saidlining hose with said fully blended activator preblend and base resin toprovide a one component pipe lining composition that can be mixed for anextended period of time and only cures when subjected to elevatedtemperature.
 2. The method of claim 1, wherein said base resin containscyclic anhydride, bisphenol A and bisphenol F resins; and said activatorpreblend containing liquid bisphenol, granular bisphenol andtetraethylenepentamine.
 3. The method of claim 1, wherein said fullyblended activator preblend and base resin remains liquid at temperaturesbelow 160 degrees Fahrenheit.
 4. The method of claim 1, wherein saidfully blended activator preblend and base resin fully cures in one hourat temperatures above 170 degrees Fahrenheit.
 5. A method of lining apipe comprising: providing a lining hose having an inner and outerlayer; providing a base resin; providing an activator preblend; fullyblending said activator preblend and base resin; wetting out said innerlayer of said lining hose with said fully blended activator preblend andbase resin to provide a one component pipe lining composition that canbe mixed for an extended period of time and only cures when subjected toelevated temperature.
 6. The method of claim 5, wherein said base resincontains cyclic anhydride, bisphenol A and bisphenol F resins; and saidactivator preblend containing liquid bisphenol, granular bisphenol andtetraethylenepentamine.
 7. The method of claim 5, wherein said fullyblended activator preblend and base resin remains liquid at temperaturesbelow 160 degrees Fahrenheit.
 8. The method of claim 5, wherein saidfully blended activator preblend and base resin fully cures in one hourat temperatures above 170 degrees Fahrenheit.
 9. The method of claim 5,wherein said outer layer of said lining hose is made from a materialselected from the group constituting of: polyvinyl chloride,polyurethane, polyethylene, polypropylene, polyester and polyamide. 10.The method of claim 5, wherein said inner layer of said lining hose is anon-woven fibrous material.